水轮机导叶“先快后慢”关闭规律适用性研究

导叶关闭规律的优化是水电站调节保证计算的重要研究内容,采用合理的关闭规律降低水锤压强与限制机组转速升高,是一种经济有效的措施。本文基于某实际水电站,建立了引水发电系统过渡过程数学模型,模拟了电站控制工况下的过渡过程,研究了导叶关闭规律对输水系统的影响,结论表明先快后慢的导叶关闭规律适用于水锤极值和转速极值出现在不同工况的水电站。先快后慢分段关闭规律解决了该类电站一段直线关闭无法满足调保计算要求的问题。

Application of quick-then-slow closing rule for turbine wicket gates

Optimizing the closing rule of turbine wicket gates is crucial to the calculations of guaranteed regulation for hydropower stations. A reasonable closing rule can reduce water hammer pressure and limit hydro turbine unit speeds, providing an effective, economical measure. In this work, we develop a mathematical model for the transient process in a water diversion system of a hydropower station, conduct simulations of the process under the control conditions of the station, and examine the influence of closing rules of turbine wicket gates on the diversion system. Results show that quick-then-slow closure is an effective rule applicable to the hydropower stations where extreme water hammer pressure and extreme rotational speed occur in different working conditions. And for this type of hydropower stations, this rule can overcome the problem with the direct closing rule that cannot meet the requirement by guaranteed regulation.